Brake controller, elevator system and a method for performing an emergency stop with an elevator hoisting machine driven with a frequency converter
First Claim
1. A brake controller for controlling the electromagnetic brake of an elevator, said brake controller comprising:
- an input for connecting the brake controller to the DC intermediate circuit of a frequency converter driving the hoisting machine of the elevator;
an input circuit for a safety signal disconnected/connected from outside the brake controller;
two outputs for connecting the brake control to a first and second electromagnets of the brake, controlled with the processor independently of each other, via the first output, electric power is supplied from the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator to the first electromagnet of a brake, and via the second output, electric power is supplied from the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator to the second electromagnet;
a solid-state switch for supplying electric power from the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator via the two outputs to the electromagnets of the brake;
a brake switching logic connected to the input circuit and configured to prevent passage of a control pulses to a control pole of the solid-state switch when the safety signal is disconnected; and
the processor, with which the operation of the brake controller is controlled by producing control pulses in the control pole of the solid-state switch of the brake controller,wherein the processor comprises a communications interface, via which the processor is connected to the elevator control; and
the brake controller is configured to disconnect the electricity supply to the first electromagnet but to continue the electricity supply from the DC intermediate circuit of the frequency converter to the second electromagnet after brake controller has received from the elevator control an emergency stop request for starting an emergency stop to be performed at a reduced deceleration.
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Accused Products
Abstract
A brake controller, an elevator system and a method for performing an emergency stop are provided. The brake controller includes an input for connecting the brake controller to the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator, an output for connecting the brake controller to the electromagnet of the brake, a switch for supplying electric power from the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator via the output to the electromagnet of a brake, and also a processor with which the operation of the brake controller is controlled by producing control pulses in the control pole of the switch of the brake controller.
27 Citations
14 Claims
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1. A brake controller for controlling the electromagnetic brake of an elevator, said brake controller comprising:
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an input for connecting the brake controller to the DC intermediate circuit of a frequency converter driving the hoisting machine of the elevator; an input circuit for a safety signal disconnected/connected from outside the brake controller; two outputs for connecting the brake control to a first and second electromagnets of the brake, controlled with the processor independently of each other, via the first output, electric power is supplied from the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator to the first electromagnet of a brake, and via the second output, electric power is supplied from the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator to the second electromagnet; a solid-state switch for supplying electric power from the DC intermediate circuit of the frequency converter driving the hoisting machine of the elevator via the two outputs to the electromagnets of the brake; a brake switching logic connected to the input circuit and configured to prevent passage of a control pulses to a control pole of the solid-state switch when the safety signal is disconnected; and the processor, with which the operation of the brake controller is controlled by producing control pulses in the control pole of the solid-state switch of the brake controller, wherein the processor comprises a communications interface, via which the processor is connected to the elevator control; and
the brake controller is configured to disconnect the electricity supply to the first electromagnet but to continue the electricity supply from the DC intermediate circuit of the frequency converter to the second electromagnet after brake controller has received from the elevator control an emergency stop request for starting an emergency stop to be performed at a reduced deceleration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14)
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9. A brake controller for controlling the electromagnetic brake of an elevator, comprising:
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an input for connecting the brake controller to a DC electricity source; an output for connecting the brake controller to an electromagnet of the brake; a transformer, which comprises a primary circuit and a secondary circuit; a rectifying bridge, which is connected between the secondary circuit of the transformer and the output of the brake controller; wherein; the input comprises a positive and a negative current conductors; the brake controller comprises; a high-side switch and a low-side switch, which are connected in series with each other between the positive and negative current conductors; a processor, with which the electricity supply to the electromagnet of the brake is controlled by producing control pulses in control poles of the high-side switch and low-side switch; and two capacitors, which are connected in series with each other between the positive and the negative current conductors; and the primary circuit of the transformer is connected between a connection point of the high-side switch and low-side switch and a connection point of the capacitors.
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Specification